brain-hackers_pepepper-mirror
/
linux-brain
mirror of https://github.com/brain-hackers/linux-brain.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

ALSA: pcm: fix fifo_size frame calculation 

The calculated frame size was wrong because snd_pcm_format_physical_width()
actually returns the number of bits, not bytes.

Use snd_pcm_format_size() instead, which not only returns bytes, but also
simplifies the calculation.

Fixes: 8bea869c5e ("ALSA: PCM midlevel: improve fifo_size handling")
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2014-09-21 22:50:57 +02:00 committed by Takashi Iwai
parent 8245b36345
commit a9960e6a29
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
sound/core/pcm_lib.c
View File

@ -1782,14 +1782,16 @@ static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
{
struct snd_pcm_hw_params *params = arg;
snd_pcm_format_t format;
int channels, width;
int channels;
ssize_t frame_size;
params->fifo_size = substream->runtime->hw.fifo_size;
if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
format = params_format(params);
channels = params_channels(params);
width = snd_pcm_format_physical_width(format);
params->fifo_size /= width * channels;
frame_size = snd_pcm_format_size(format, channels);
if (frame_size > 0)
params->fifo_size /= (unsigned)frame_size;
}
return 0;
}